Balanced draft apparatus for furnaces.



PATENTED DEC. 4, 1906.

0. QUE. BALANCED DRAFT APPARATUS FOR FURNACES.

APPLICATIOA FILED JAN, 2 1906.

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CHARLES T. (TOE, O F KE BALANCED IDHAFT APPARATUS FOR FURNACES.

Specification of Letters Patent.

ARNEY, NEW JERSEY.

Patented Dec. 4, 1906.

Application filed January 2, 1906. Serial No. 294,286.

To all whom it may concern:

Be it known that I, CHARLES T. 00E, a citizen of the United States, and a resident of Kearney, in the county of Hudson and State of New Jersey, have invented certain new and useful Improvements in Balanced Draft Apparatus for Furnaces, of which the followingis a specification.

This invention relates to improvements in a balanced draft apparatus applicable to furnaces. Its organization comprises a regulator controlling a damper and a blower, either with the same or different amounts of movement, the regulator being operated by a fluid-like steam, the pressure of which is de pendent upon the heat of the furnace.

The invention is specifically a plicable to steam-boilers where abalanced Forced draft is to be maintained. The air supplied to the furnace is practically maintained at atmospheric pres ure in the fire-chamber. The position of the damper in the chimney or flue of a boiler with this invention prevents all suction in said chimney or flue, and the blower acting in conjunction with said damper allows just a suilicient quantity of air to pass through the furnace at the requisite rate of speed to tion of the fuel in an e'liicient mam-r. The temperature of. the furnace is not reduced by an influx of too great a quantity of air, and the velocity of the burning gases is maintaincd at a speed which yields a greater number of heat units than with the ordinary a urtenances of a furnace and whether he atter is burning draft.

The mechanical elements of the invention are exem lified in the accompanying drawings, in W 'ch- Figure 1 shows a boiler with its furnace and chimney in section and the appurtenances of the invention connected therewith; Fig. 2 shows a plan view of a stepped or cone pulley shown in elevation in Fig. 1. "Fig. 3 shows a plan view of a modification of the ste ped pulley. 7:

X boiler A is shown with its 'grates B fire- D, steam-outlet piping E, and ash-pit F. A blower-pipe G extends through the lower portion of the boiler-sett ng, with its outlet terminating in the ashpit F. Steam-supply piping H is fitted with the automaticallycontrolled inletvalve I and hand-controlled val ve J, the latter valve chimney supply air for the COI11bllF- fuel with or without forced having connected thereto the handle J. The valve I has the lever' I with the weight 1 and the chain or cord I passes over a guide-pulley K and then leads to one of the steps L of the stepped pulley L. The valve J has the lever J, spring J to keep the valve open, and the valve-rod J From the step Uof the pulley L extends the chain or cord M, that leads over the double-grooved pulley K and is secured to the arm N of the ddmper N, the latter being fulcrumed on the spindle N 2 and having the arm Novith the counterweight N. From the step L f the pulley L extends the chain or cord 0, that is fastened to the lever P of the regulator P. Piping Q with the valves Q and 2 connects the piping E with the regulator P.

To operate the invention, the inlet-valve I is set so that the normal pressure to be used will keep it off of its seat to allow su'llicient to maintain a normal draft and balanced air-pressing through the fire on the grates B and into andthrough the fire-chamber O and chimney D. The damper at the same time is maintained at an inclination 'b y means of the chain M to preserve this condition of the pressure of the air and allow the escape of the products of combustion. Should the steampressure in the boiler fall below the normal pressure, the said lower pressure of steam acting with the regulator P increases the opening through the valve I and increases the jets of steam forced through the blowerpipe G, thereby increasing the draft and at the same time the chain M will move the damper N, so as to obtain a greater area of 0 ening through the chimney The ciiains M and I are moved by the rotation of the stepped pulley L, which latter is-operated by means of the chain 0 and lever I of the regulator. Should the pressure rise, the reverse 0 erations will take lace by reason of the pn ley L being turned in an opposite direction, thereby tending to'close the valve I and the damper N It will be noted that with the pulley having the steps or cones of different diameters the stroke of the lever P of the regulator is transmitted to the same, and from the pulley different strokes, are obtained for the valve I and damper N. The pulley could have more steps than shown, so as to give a greater or less movement to either the said valve I or the damper N. The stepped pulley could steam to issue from the jets G of the blower be m ade, as shown in Fig. 3, with some of the steps R of the pulley It of the same dia1neter.

Having described my invention, I claim.

1. In a balanced draft apparatus thecombination of a boiler, a furnace-for the boiler, a line for the furnace, a damper in said :fiue. a blower for the furnace, a valve for the blower, a regulator operated by the steampressure of the boiler, an element between the regulator and the said valve and the said damper, with which the two latter elements can be given different amounts of movements with variations of the said steampressure. v r

2. In a balanced draft apparatus the combination of a boiler, a furnace for the boiler, a flue for the furnace, a damper in said flue, a blower connected with the furnace, a regulator connected with the boiler, a valve for the blower, a pulley with steps of different diameters journaled between the regulator and said damper and said valve, a connection between the regulator and one of the steps of the pulley, a connection between another step of the pulley and the damper, a'connection between a third step of the pulley and the said valve to enable the said blower and said valve to be operated simultaneously.

3. In a balanced draft apparatus the combination of a furnace, a flue for the furnace, a damper in said flue, a blower for the furnace, an inlet-valve for the blower, a' regulator, a

pulley with steps of different diameters journaled between the regulator and the damper 5 and the inlet-valve of the blower, a chain eX tending from the regulator to one of the steps of the pulley, a chain extending from a step of the pulley to the damper, and a chain I 1 extending from one of the steps of the pulley b to the inlet-valve of the blower, to enable the blower and the valve to be operated simhltaneously. r

4, In a balanced draft apparatus the com bination of a steam-boiler, a furnace for the 45.

from a step of the pulley to the damper, and .55"

a chain extending from one of the steps of v the pulley to the inlet-valveof the bl'owefi to enable the blower and the valve to befjper ated simultaneously. "f a Y Signed at New York, in the county of New 6 York and State of New York, this 19th day of December, A. D. 1905.

CHARLES T. COE. l/Vitnesses: 1

PHILIP FARRELL, W. H. Bowuz. 

